September is one of the warmer months of the year in Poughkeepsie, with average highs near 24.2°C and lows around 12.2°C (mean 18.2°C). It is about average for rainfall, averaging 111 mm of rainfall and 74% relative humidity across the period.
September is one of the warmer months of the year in Poughkeepsie. Across 45 years of records, the warmest September in Poughkeepsie was 2005 — when the month averaged 21.1°C — while the coldest was 1984 at 15.4°C. Typical September days reach 24.2°C with nights near 12.2°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Poughkeepsie, averaging 111 mm of rainfall. The wettest September on record was 2011 with 263 mm, while the driest was 2014 at 28 mm.
Relative humidity in Poughkeepsie during September averages 74%. The most humid September was 2011 at 87%, and the least humid was 1983 at 62%.
September receives about 4.3 kWh/m²/day of solar energy in Poughkeepsie. The sunniest Septembers were 1984 and 2007 at 4.9 kWh/m²/day, and the cloudiest was 2018 at 3.3.
Average wind speed in Poughkeepsie during September is 0.2 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.2 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.3°C | 17.5°C | 18.2°C | 19.2°C | 19.0°C | +1.7°C |
| Avg High | 23.6°C | 23.4°C | 24.2°C | 25.3°C | 24.8°C | +1.2°C |
| Avg Low | 11.0°C | 11.5°C | 12.3°C | 13.2°C | 13.2°C | +2.2°C |
| Avg Rain | 94 mm | 114 mm | 118 mm | 106 mm | 126 mm | +33 mm |
September temperatures in Poughkeepsie have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.4°C (1991) to a record high of 35.5°C (2015).
Rainfall in September is about average for rainfall, averaging 111 mm, with a wettest year of 263 mm.
One of the best times to visit Poughkeepsie
September is one of the best times to visit Poughkeepsie. Expect days averaging 24.2°C and nights around 12.2°C (mean 18.2°C) — warmer than Poughkeepsie's yearly average — with higher rainfall (111 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.5°C | 20.0°C | 13.6°C | 30.3°C | 9.1°C | 63 mm | 71% | 0.2 m/s | 4.5 |
| 2024 | 25.4°C | 19.1°C | 12.8°C | 30.2°C | 8.4°C | 32 mm | 72% | 0.2 m/s | 4.4 |
| 2023 | 24.1°C | 18.9°C | 13.7°C | 34.1°C | 6.5°C | 236 mm | 82% | 0.2 m/s | 3.9 |
| 2022 | 24.4°C | 18.7°C | 13.0°C | 31.5°C | 5.9°C | 128 mm | 74% | 0.2 m/s | 4.3 |
| 2021 | 23.8°C | 18.7°C | 13.6°C | 28.2°C | 7.7°C | 213 mm | 82% | 0.2 m/s | 4.3 |
| 2020 | 24.8°C | 18.6°C | 12.3°C | 30.8°C | 3.0°C | 86 mm | 71% | 0.2 m/s | 4.4 |
| 2019 | 26.0°C | 19.3°C | 12.6°C | 32.2°C | 5.2°C | 32 mm | 68% | 0.2 m/s | 4.5 |
| 2018 | 24.5°C | 19.7°C | 15.0°C | 33.4°C | 7.0°C | 191 mm | 84% | 0.2 m/s | 3.3 |
| 2017 | 25.7°C | 19.8°C | 13.9°C | 33.6°C | 7.2°C | 60 mm | 73% | 0.2 m/s | 4.4 |
| 2016 | 26.8°C | 20.4°C | 14.1°C | 33.1°C | 5.4°C | 42 mm | 66% | 0.2 m/s | 4.4 |
| 2015 | 27.5°C | 20.8°C | 14.1°C | 35.5°C | 6.9°C | 122 mm | 70% | 0.2 m/s | 4.7 |
| 2014 | 25.6°C | 19.0°C | 12.5°C | 33.4°C | 5.7°C | 28 mm | 68% | 0.2 m/s | 4.5 |
| 2013 | 23.6°C | 17.0°C | 10.5°C | 34.3°C | 3.7°C | 62 mm | 72% | 0.2 m/s | 4.6 |
| 2012 | 23.8°C | 18.0°C | 12.1°C | 31.8°C | 5.7°C | 159 mm | 77% | 0.2 m/s | 4.2 |
| 2011 🌧️ | 23.4°C | 18.8°C | 14.2°C | 28.4°C | 5.6°C | 263 mm | 87% | 0.2 m/s | 3.8 |
| 2010 | 25.7°C | 19.6°C | 13.4°C | 34.6°C | 6.5°C | 105 mm | 70% | 0.2 m/s | 4.3 |
| 2009 | 22.4°C | 16.8°C | 11.1°C | 27.2°C | 5.3°C | 52 mm | 78% | 0.2 m/s | 4.3 |
| 2008 | 23.9°C | 18.3°C | 12.6°C | 33.9°C | 5.5°C | 174 mm | 79% | 0.2 m/s | 4.4 |
| 2007 | 26.5°C | 19.8°C | 13.0°C | 32.8°C | 5.4°C | 45 mm | 69% | 0.2 m/s | 4.9 |
| 2006 | 21.8°C | 16.6°C | 11.4°C | 26.6°C | 5.3°C | 104 mm | 81% | 0.2 m/s | 3.9 |
| 2005 🔥 | 28.1°C | 21.1°C | 14.1°C | 34.5°C | 7.1°C | 40 mm | 63% | 0.2 m/s | 4.8 |
| 2004 | 23.7°C | 18.3°C | 13.0°C | 28.7°C | 6.4°C | 232 mm | 83% | 0.2 m/s | 4.1 |
| 2003 | 22.6°C | 17.7°C | 12.8°C | 26.4°C | 6.0°C | 215 mm | 84% | 0.2 m/s | 3.8 |
| 2002 | 25.8°C | 19.4°C | 13.1°C | 35.0°C | 7.2°C | 106 mm | 70% | 0.2 m/s | 4.5 |
| 2001 | 24.6°C | 17.8°C | 11.1°C | 31.7°C | 5.3°C | 105 mm | 69% | 0.2 m/s | 4.6 |
| 2000 | 22.7°C | 16.6°C | 10.4°C | 29.4°C | 0.4°C | 105 mm | 76% | 0.2 m/s | 4.2 |
| 1999 | 24.0°C | 18.4°C | 12.9°C | 33.4°C | 6.5°C | 261 mm | 78% | 0.2 m/s | 4.1 |
| 1998 | 25.9°C | 19.1°C | 12.2°C | 32.2°C | 4.0°C | 68 mm | 69% | 0.2 m/s | 4.4 |
| 1997 | 23.1°C | 17.1°C | 11.0°C | 29.4°C | 2.8°C | 73 mm | 72% | 0.2 m/s | 4.5 |
| 1996 | 22.9°C | 17.9°C | 12.8°C | 31.9°C | 6.1°C | 161 mm | 79% | 0.2 m/s | 3.6 |
| 1995 | 23.7°C | 17.2°C | 10.8°C | 30.8°C | 4.2°C | 86 mm | 66% | 0.2 m/s | 4.3 |
| 1994 | 22.6°C | 16.8°C | 10.9°C | 28.4°C | 6.8°C | 97 mm | 75% | 0.2 m/s | 4.3 |
| 1993 | 23.1°C | 17.6°C | 12.1°C | 32.0°C | 2.9°C | 140 mm | 75% | 0.2 m/s | 3.4 |
| 1992 | 23.0°C | 17.1°C | 11.3°C | 29.5°C | 2.2°C | 85 mm | 75% | 0.2 m/s | 4 |
| 1991 | 23.3°C | 17.0°C | 10.6°C | 33.9°C | 0.4°C | 122 mm | 70% | 0.2 m/s | 4.3 |
| 1990 | 22.7°C | 16.7°C | 10.7°C | 29.1°C | 2.4°C | 50 mm | 76% | 0.2 m/s | 4.4 |
| 1989 | 23.4°C | 17.5°C | 11.6°C | 34.1°C | 1.6°C | 148 mm | 77% | 0.2 m/s | 4.1 |
| 1988 | 23.1°C | 16.5°C | 9.8°C | 28.4°C | 3.9°C | 63 mm | 72% | 0.2 m/s | 4.7 |
| 1987 | 21.8°C | 16.6°C | 11.5°C | 26.2°C | 3.2°C | 178 mm | 83% | 0.2 m/s | 3.8 |
| 1986 | 23.7°C | 17.4°C | 11.2°C | 30.0°C | 3.8°C | 40 mm | 71% | 0.2 m/s | 4 |
| 1985 | 24.5°C | 18.1°C | 11.7°C | 31.0°C | 4.9°C | 142 mm | 73% | 0.2 m/s | 4.4 |
| 1984 ❄️ | 21.7°C | 15.4°C | 9.0°C | 28.8°C | 3.6°C | 45 mm | 73% | 0.2 m/s | 4.9 |
| 1983 | 26.5°C | 19.1°C | 11.8°C | 34.6°C | 4.6°C | 69 mm | 62% | 0.2 m/s | — |
| 1982 | 24.7°C | 18.1°C | 11.4°C | 31.0°C | 7.3°C | 61 mm | 69% | 0.2 m/s | — |
| 1981 | 23.0°C | 17.1°C | 11.2°C | 30.7°C | 2.3°C | 95 mm | 70% | 0.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 24.2°C with lows near 12.2°C (mean 18.2°C), based on 45 years of NASA POWER data.
September averages 111 mm of rainfall in Poughkeepsie, about average for rainfall. The wettest on record was 263 mm in 2011.
The hottest September reached 35.5°C in 2015. The coldest dipped to 0.4°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 24.1°C to 24.8°C and overnight lows from 11°C to 13.3°C over the same span.
September is one of the warmer months of the year in Poughkeepsie and about average for rainfall, so plan for around 24.2°C daytime highs and 12.2°C at night.
Not quite — September is the 9th coolest month in Poughkeepsie, averaging 18.2°C.
For September in Poughkeepsie, pack light layers you can adjust through the day, with typical highs of 24.2°C and lows of 12.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 74% — moderately humid.
Average wind speed in September is 0.2 m/s. The windiest September on record averaged 0.2 m/s (1981).
The wettest September on record was 2011 with 263 mm. On average, September sees 111 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Poughkeepsie behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
